Saw-carriage for cutting bevel-boards.



No. 775,787. PATENTED NOV. 22, 1904.

' v. A. W. TAIT.

SAW CARRIAGE FOR CUTTING BEVEL BOARDS.

A APPLICATION FILED MAR. 1, 1904. no monm... I 2 sums-45mm 1.

WITNE8 8E 8: I A l INIA/ENTOR JZrehur MIT/zit.

No. 775,787. PATENTED NOV. 22, 1904.

- A. W. TAIT.

SAW CARRIAGE FOR CUTTING BEVEL BOARDS.

' APPLIGATION FILED MAR.1, 1904.

N0 MODEL. A 2 SHEETSSHEBT 2.

- INVENTOR J/f/wr if 7212'2.

UNITED STATES Patented November 22, 1904.

PATENT OFFICE.

ARTHUR W. TAIT, OF VANCOUVER, CANADA.

SAW-CARRIAGE FOR CUTTING BEVEL-BOARDS.

SPEGIFIGATION'fbrming part of Letters Patent No. 775,787, dated November 22, 1904.

. Application filed March 1,1904.

To all whom it may concern:

Be it known that I, ARTHUR W. TAIT, a citizen of the Dominion of Canada, residing atthe city of Vancouver, in the Province of British Columbia, Canada, have invented a new and useful Improvement in Saw Carriages for Cutting Bevel-Boards, of which the following is a specification. Y

My invention relates to a saw-carriageby means of which clapboards orbevel siding can be cut from a sawed cant by either a circular or bandsaw. This work is at present performed in a manner that involves a considerable Waste of material, and asit is generally performed in more than one operation the work involves rehandling, with consequent expense and loss of time. These faults in the present practice I have endeavored to avoid by mounting on a log-carriage of ordinary construction a tilting seator reston which the cant is placed, which seat may be angled al-,

ternately up and down to the plane of the saw.

mounted in bearings 11 on the carriage-frame An essential feature in the invention is the particular ratio which the distance from the cant-seat to the axis of the pivot bears to the distance of that axis from the plane of the saw, the adoption of which ratio enables two boards of a definite width and taper to be cut from the cant with one set of the cant toward the saw.

A secondary feature consists of means whereby when it is required to change the taper of the siding the same advantage of cutting two boards with one set may be retained without changing the position of the axis of the pivotally-mounted seat.

The particular manner by which I. attain these results is fully set forth in the following specification and illustrated in the drawings which accompany it, in Wh1Cl1%- Figure 1 is an end elevation of a log-carriage fitted with a tilting cant-seat; Fig. 2, a plan of the same; Fig. 3, an elevation from the back; Fig. 4, a detail to an enlarged scale of the set mechanism, being a cross-section on the line a a in Fig. 5; Fig. 5, a similar detail in sectional elevation showing the relation of the set mechanism to the tilting cant-seat member; and Fig. 6, a diagrammatic detail showing the principle by which two boards are cut $erial No. 195,993. (No model.)

with one set. Fig. 7 is a detail section taken on the line? 7 of Fig. 1.

In the drawings I have shown the application of my invention to a short carriage, but

it must be distinctly understood that the device is applicable to any length of cant by merely multiplying the number of cant-seats to the requirements of the length.

In the drawings the plane of the saw-cut is represented by 2 and the log-carriage frame by 3, the frame being provided with wheels and axles 4 and 5, on which it is moved past the saw by suitable mechanism on rails 6, the wheels being grooved to engage the rails laterally and insure steadiness in the line of movement, as is customary with carriages of this kind. The carriage-frame 3 is permitted f a limited amount of endwise movement on the axles-that is, movement to and-from the plane of the saw-cut, the reason for which -will be explained later. V

Secured to a shaft 10, which is pivotally 3, is a series of cant-seat. members 12, the number of which is adapted to the length of the cant the machine is designed to use. These cant-seatmembers extend forward toward the saw-face as close as practicable and rearward a similar amount on the opposite side of the pivot-axis, and these members are keyed on their pivot-shaft 10 andotherwise braced and tied together that they may be simultaneously tilted as one frame on the axis of their pivot. Each cant seat member is provided at the back end with a segmental rack 16, in which meshes the teeth of pinions 13, secured on a shaft 14, extending the length of the carriage and rotatable in bearings 15 on the carriage-frame 3. The shaft 14 is rotated by means of a lever 17 secured to it, whichlever is provided with a segmental guide 18, bolted to the frame 3 of the carriage and having a detent-latch 19, by Which the tilt movement may be limited in the several positions required. This. latch may be supplemented by stop-pins 20, so that the limit of the tilt movement may be more readily determined. a Instead of the lever 17 being directly secured to the shaft 14'it is pivotally mounted on a member 21, which is keyed to the shaft, and the position of the lever may be adjusted in this member by set-screws 22 in lugs 23. This manner of connecting the lever to the shaft enables the tilt of the cantseat to be so adjusted that it will move an equal distance on each side of the horizontal and is designed to avoid the effect of settlement due to wear or to the shrinkage of the frame or foundations.

The upper side of each cant-seat member is dovetailed in cross-section, and fitting this dovetail is a rack member 25, the teeth of which mesh with the teeth of a pinion 26, recessed into the upper side of the cant-seat member 12. These pinions are secured on a shaft 27, rotatable in bearings 28, secured to the cant-seat member 12. The shaft 27 is rotated (see Figs. 4 and 5) by means of a finetoothed ratchet-wheel 29 secured to it toward one end and operated by a multiple pawl 30, carried in a pawl-frame 31, which frame is rotatably mounted on the shaft 27 and operated by a lever 32 secured to it. The lever is slidable against a segmental guide 33, which is fixed to a bracket member 34, secured to the inner side of the adjacent cant-seat member. This bracket also carries a multiple check-pawl 35, which is more particularly required when the head-blocks (to be described) are fitted with a spring-return. The segmental guide 33 for the lever 32 may be graduated, as at 33 to afiord a means of regulating the set, and may be further provided with pin-holes 33, into which a stop-pin may be inserted to determine the set.

The shaft on which the pinions are secured and by which the rack members of the several cant-seats are operated extends the length of the carriage, so that the several rack members are simultaneously operated; but to brace them together a stout I-beam 40 extends over the several cant-seats and is notched onto and strongly bolted to the end of each rack member toward the saw, and on the upper side of this beam 40 and immediately above each cant-seat member is a knee 41, which is also notched into the I-beam and may be secured. thereto by the same bolts which secure the beam to the rack members. As the rack members are dovetailed onto the cant-seat members, the I-beam serves to brace the cant-seat members together as one frame, which bracing is supplemented by a tie-rod 42, which passes through them all toward the front end and has tubular distance-pieces 43 between each pair. Along the length of the I-beam 40 are secured upwardly-projecting stems 45, which carry the dogs 46, by which the sawed cant may be secured on the tilting seat.

This description covers the construction of the tilting frame and the means by which it may be tilted and its knee set forward to the cut, and as on this construction alone I base :an important feature of my invention before proceeding further I shall describe the operation of its mechanism to cut bevel-siding 5 boards.

A sawed cant being placed on the seat members of the tilting carriage and secured against the knee the limits of the tilt above and below the horizontal are adjusted to the taper of the board it is desired to out. For example, assume that boards six inches wide are required, the thickness of the edges being five-eighths and one-fourth of an inch, respectively. The cant-seat will under these conditions require to be tilted (see Fig. 6) to an angle the same as the taper of the board desired t'. 6., the total angle of the cant-seat 'tilt between its lower and its upper positions must be in this case three-fourths of an inch to the foot, but in determining the position of the axis on which the cant-seat tilts it is necessary to consider the conditions under which two boards may be cut by one set. One board-cut is taken when the cant is upwardly tilted, the under edge of the cut board being the thicker onefive-eighths of an inch in this instance-and the second cut is taken when the cant is tilted down, as shown in dotted lines, the lower edge of the cut board being the thinner one. The set for two boards must therefore be a thick edge, five-eighths plus a thin one, one-fourth of an inch, plus one-fourth of an inch for twice the saw-kerf, equal in all to one and one-eighth inches, and as the set is to be given when the cant is upwardly tilted it must carry the lower edge of the sawed face of the cant three-fourths of an inch past the front face of the saw, so that allowing one-eighth of an inch for the saw-kerf the board thickness will be five-eighths, as required. To comply with this requirement, the lower edge of the sawed face (see full lines in Fig. 6) must bewithdrawn three-eighths of an inch from the saw-face in moving to the upward tilt. Then when the one and one-eighth setis given (see dot-and-dashlines in Fig. 6) a board of the required thickness and taper may be cut, and when the cant is tilted to the lower position (see dotted line 71 in Fig. 6) the lower edge will be advanced the three-ei ghths, which, allowing for one-eighth of an inch saw-kerf, will give a second board of the same taper, but reversedthat is, one-fourth thick on the lower edge and five-eighths on the upper. This withdrawal and advance of the lower edge of tliesawed face of the cant is determined by the location of. the axis on which the cant-seat tilts, for if the distance of the axis from the face of the saw is determined then the amount of vertical movement of the lower edge of the sawed face of the cant to give a certain bevel can be ascertained, and from the board thickness and the saw-kerf can be ascertained the amount of withdrawal and advance necessary to fulfil the requirement of cutting two boards with one set. From these terms, then, the distance of the axis below the cant-seatcan be ascertained, as it must bear the same proportion to the distance from the saw as the required withdrawal and advance does to the 'vertical movement of the lower edge of the sawed face of the cant. Thus if the cant-seat is designed to cut the size of board before referred to-viz., six inches wide with thicknesses of five-eighths and one-fourth inch and the saw-kerf is one-eighth of an inch and if twenty-four inches is determined as a convenient distance of the axis from the saw-facethen the lower edge of the sawed face of the cant will require to move vertically one and one-half inches to give the taper required of three-eighths of an inch in six inches, and the withdrawal and advance must be the thickness of the thinner edge plus one saw-kerf one-eighth of an inch 0., three-e'ighths of an inchand the vertical distance of the axis below the cant-seat surface is to twenty-four as three-eighths is to one and one-half inches. This establishes the location of the axis of the cant-seat; but there is a further requirement involved if a change of taper and board thickness is required from that for which the tilting frame is-designed. For example, if with the same width of board the edges are required to be five-eighths and one-eighth inch, respectively, or a taper of one-half an inch in six inches, then with the axis located as before described, twenty-four inches from the saw-face and six inches below the cant-seat, the lower edge of the sawed face of the cant must move two inches in vertical distance from the lower to the upper tilt, and that lower edge will be withdrawn and advanced one-half an inch in making that movement; but the set for two cuts of such board thicknesses must be five-eighths plus one-eighth plus one-fourth for saw-kerfs, or one inch in all, and this set will carry the lower edge of the sawed face only one-half an inch past the front face of the saw instead of the three-fourths required to give five-eighths-thick edge, so that it becomes necessary to advance the cant onefourth of an inch farther in tilting it to the upward position. Similarlyafter a board has been cut on the upper tilt in lowering the cant to the lower position the edge is advanced one-half an inch, while to cuta thin edge of one-eighth of an inch it should be only onefourth of an inch beyond the front face of the saw, so on the lower tilt the cant must be withdrawn one-fourth more than what is accomplished by the tilting. Again, if a less taper is required, as when a board is to have edges of five-eighths and three-eighths or a taper of one-half an inch to the foot, the lower edge of the sawed face of the cant must be tilted one inch in all,.and with such movement the edge will be withdrawn and advanced onefourth of an inch. The set for boards of. such thickness will be five-eighths plus threeeighths plus one-fourth, equal to one andonefourth, which will on the upper tilt advance the lower edge of the cant one inch past the front face of the saw instead of the threefourths required, and it is therefore necessary to withdraw the cant one-fourth of aninch. Similarly on the lower tilt the edge will be advanced one-fourth of an inch, while to cut aboard with a thin edge of three-eighths it will require one-half an inch; so that on the lower tilt a supplementary ad vance of a fourth maintained in the central position or moved either way, as required, by means of a sleeve 50, in which the axles are rotatable, such sleeve being secured against endwise movement by collars 51, secured to the axle on each side of the sleeve. The sleeve is provided with a laterally-projectingv stud 52, on which a lever 53 is fulcrumed, and the lower end of this lever 53 is pivotally connected by a pin 5 1 to a bracket 55, secured to the carriageframe 3. The upwardly-projecting end of this lever 53 is connected by a link-rod 56 to a pin 57, which is adjustably secured by aT- head in a corresponding groove 58 across the face of a disk 59, fixed on the end of the shaft 14:, by which the tilting of the cant-seat members is effected, so that the disk is rotatable with the shaft.

Where boards of an average taper and thickness are required, for which the tilting cant,- seat has been designed, the T-headed pin 57 is secured on the axis of the disk, in which position no movement is imparted to the carriage on its axles when the cant-seats are tilted, but it is by means of the sleeve and its lever and link connections maintained in a fixed central position; but if it is required to cut boards of a quicker taperthe pin 57 is moved down in the T-groove and secured in such a position that in the movement of the shaft to tilt the cant-seat up the pin 57 will be correspondingly drawn back and by means of the link-rod 56 and the lever 53, fulcrurned on the sleeve-stud 52, the carriage 3, by means of the bracket 55, will be moved toward the saw, and the required supplementary advance will be obtained. On moving the shaft 14 in the opposite direction to tilt the cant down the carriage 3 will in the same manner be withdrawn as required. If boards of aless. taper are required, the pin 57 is secured in the T-grbove 58 above the axis of the shaft, under which conditions the movements are reversedthat is, as the cant is tilted up the carriage 3 is withdrawn and advanced when the cant is tilted down, This carriage-moving mechanism may in longer carriages be applied to each end of the shaft 14.

The device may be used with a circular or an ordinary band saw, but is preferably apaplied to a saw of the latter class having two cutting edges, as a board may then be cut from the cant during both the advance and return of the carriage, and the output will be doubled.

In the application of the device I do not desire to be confined to the particular construction of frame revealed in the drawings herewith nor to the tilting and set mechanism there illustrated, as such may be varied to suit the convenience of the work to be done or the requirements of manufacture without departing from the spirit of the invention, which lies in the location of the pivotal axis, which location enables the cant to be advanced to and withdrawn from the saw by the tilt movement an amount adapted to the dimension of any particular board, and, further, in the means by which such advance and withdrawal may be varied to adapt the frame to a change of board dimensions required without changing the position of the axis in relation to the tilting mechanism.

I am aware that prior to my invention pivotally-mounted log-seats have been provided on saw-carriages and have, perhaps, been operated in a similar manner to obtain the set and cant; but I believe I have been the first to adapt such a pivotally-mounted frame to the requirements of cutting bevel siding from a sawed cant and to establish the particular ratio by which the location of pivotal axis from saw-face and cant-seat is determined fromthe board dimensions to enable two boards to be cut with one set. I further believe that I have been the first to employ cooperatively therewith the means for moving the carriage on its axles to add to or lessen the movement of the cant produced by the tilt to or from the saw.

I therefore claim as my invention and desire to be protected in by Letters Patent 1. In a device for cutting bevel boards from a sawn cant; the combination with a carriage end wise slidable to and from the cutting plane of the saw on the axles of the carriage wheels, which wheels are in engagement with the sides of the rails on which they run, of a cant-seat on the carriage which cantseat is pivotally mounted on an axis parallel to the plane of the saw-cut, means for setting the cant toward the saw, means for tilting the cant-seat, and means cooperative with the tilting mechanism whereby the cant-seat may be advanced to or withdrawn from the cutting plane of the saw.

2. In a saw-carriage endwise slidable on its axles; the combination therewith of a cant-seat frame susceptible of being tilted on an axis parallel to the plane of the saw-cut, means for setting the cant on the seat, a shaft having pinions to engage rack-segments on the cant- :seat members and tilt the cant-seat on its axis,

a sleeve between collars on one or more of the carriage-axles, a lever fulcrumed on the sleeve and pivotally connected to the carnage-frame,

means for moving such lever back and forth by the rotation of the shaftwhich operates the tilting, and means for varying such movement.

3. In a saw carriage for cutting radial boards; the combination with a tilting frame, of the disk 59 secured to the shaft by which the tilt-ing is effected, the T-groove 58 across it, the pin 57 adjustable in the Tgroove, the link-rod 56, the lever 58, fulcrumed on the pin 52 of the sleeve between the collars 51 on the axle 5, and the attachment of the lever 53 by the pin 54 to the bracket 55 secured to the carriage-underframe 3.

a. In a saw-carriage, having a tilting cantseat for bevel-boards, said seat being pivoted to said carriage, means for simultaneously rocking said seat on its pivot and moving the same toward the saw.

5. In a saw-carriage having a tilting cantseat for bevel-boards, a lever by which said tilt is effected, means cooperatively joined with said lever for simultaneously moving said seat toward or away from the saw, for the purposes specified.

6. In a saw-carriage having a tilting cantseat for bevel-boards, a lever by which said tilt is efi'eeted, means cooperatively joined with said lever for simultaneously moving said seat toward or away from the saw, and means for regulating the extent of said movement toward or from the saw without altering the extent of the tilting movement of the seat, for the purposes specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ARTHUR WV. TAIT. 

